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Gentiana cruciata 'Blue Cross' is a cultivar bred to be easier to grow and to have a bushier, more compact growth habit.
Gentiana makinoi 'Royal Blue' has tubular, true royal blue flowers on tall stems to about three and a half feet high.
Gentiana 'True Blue' produces true, royal blue flowers on tall stems in summer.
The large flowers of Geranium 'Irish Blue' are totally blue with a soft tint of pink toward the centre and darker veins all along the petals.
Geranium pratense 'Delft Blue' has unique flowers that are white with variable stripes and flecks of blue and lavender blue. Each flower is different.
Geranium 'Azure Rush' is a sport of 'Rozanne' with lighter blue flowers and a more compact habit.
Geranium 'Blue Sunrise' has silver blue to lavender-blue flowers all summer long. New foliage is orange then yellow then light green.
Geranium 'Havana Blues' has yellow-green foliage topped for months with blue flowers.
Geranium 'Jolly Blue' has lavender-blue to true blue flowers from spring to fall and a vigorous spreading and cascading habit.
Geranium 'Philippe Vapelle' is a cranesbill that has bluish-purple flowers and cool, textured foliage.
Geranium 'Rise and Shine' has purple-blue cranesbill flowers with white centres from June until frost! One of the best of all hardy geraniums.
Geranium 'Rozanne' has purple-blue flowers from June until frost! One of the best of all hardy geraniums and a Perennial Plant of the Year.
Geranium 'Sabani Blue' is an early-blooming hybrid forming mounds of deeply-cut green leaves topped with clusters of bluish violet flowers with attractive dark veins.
Useful groundcover offers round green leaves dappled in creamy white.